chore(deps): update ghcr.io/vexxhost/openstack-venv-builder:zed docker digest to 31728b9 (stable/zed)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/vexxhost/openstack-venv-builder	stage	digest	b465b5f → 31728b9

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renovate[bot]
This pull request has been included in the following image tags:

ghcr.io/vexxhost/python-openstackclient:zed
ghcr.io/vexxhost/python-openstackclient:stable-zed
ghcr.io/vexxhost/python-openstackclient:3b356e5
ghcr.io/vexxhost/python-openstackclient:latest

Digest: ghcr.io/vexxhost/python-openstackclient@sha256:7c301a10597df95f7282f3dae9807264f1bba7401d8f10631a2360d1f8075b54